Knife-grinder.



l PATBNTED 00T. zo. 1903.

` J. W. LATIMER.

KNIFE GRINDBR.

APPLICATION FILED JUNE 9, 1902. l N0 MQDBL., 3 SE'IEBTS-SHEEI I.

lumTi lll` PATENTBD 001120,; "1903;

'J. W. LATIMER.' KNIFE GRINDER.

n ABPLIUATION FILED JUNE 9, 1902.

a sHg'nTs-SHBET. s,

No xoDBL.

@www

- UNITED STATES Patented October 20, 1903.

iPATENT OFFICE.

.I OHN W. LATIMER, OF CHICAGO, ILLINOIS, ASSIGNORTO DEERING HAR- VESTER COMPANY, OF CHICAGO, ILLINOIS.

KNIFE-GRINDER.

SPECIFICATION for-ming' part of Letters Patent No. 741,681, dated October 20, 1903.

Application filed June 9. 1902. Serial No. 110,948. (No model.)

To all whom, it may concern:

Be it known that I, JOHN W. LATIMER, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Knife-Grinders,of which the following is a full description.

This invention relates to machines for sharpening cutting-tools, but is especially adapted to grinding mowerfknives. It has for its object the improvement in the general construction of this class of machines and the combining of parts whereby the grinder is rendered either automatic or hand-operated at will. The rotating grinding-wheel can have an oscillatory movement relative to the knife on whichit is operating, or the knife maybe given a rocking motion by hand,which will present all parts of the edge of a section or sections to the rotating grinding-wheel, even when the latter is so locked as to prevent it from oscillating. If desired, a grinding-wheel of different contour in lieu of a double-cone wheel may be substituted when the axis of the latter is made fixed and an auxiliary rest attached instead of the usual one that clamps the harvester-knife. A combination of features is thus presented which collectively will enable the machine to grind sickles, gum saws, `or sharpen cutting-tools generally.

In the accompanying drawings, Figure l is a perspective view of the complete machine, showing it clamped to a rigid table, but may be considered to be a mower-wheel. Fig.' 2 is a side elevation, partly in s'ection, of the machine partially stripped of the gearing and sprocket-wheels. Fig. 3 is a side elevation of the same, showing the knife-supporting frames detached from spring-fastening and dropped back, the auxiliary rest clamped in place, and the grinding-wheel frame locked in position. Fig. 4 isa fragmentary plan of the machine, showing the arrangement of gears and pinions whichimpart rotary motion to the grinding-wheel and an oscillatory motion to the frame on whichthe grindingwheel is mounted. Fig. 5 is a side elevation of a portion of the frame which bears the grinding-wheel with the lever and its connections by means of which the frame is oscillated. Fig. 6 is an elevation ofthe same portions of the grinding-wheel frame viewed from the'opposite side, showing the lever by which the wheel-supporting frame is held in a fixed position. Fig. 7 is an end elevation of the main frame; and Fig. 8 is a portion of the secondary frame, the knife -holding bracketV showing manner in which the two are locked together.`

A and A0 are .the two lir'nbs forming the hase of the main frame.

A is a bracket extending downward and in the saine direction as the limbs A and Ao and receiving a thumb-screw A3, by which the main frame issecured to the mower-wheel, table, or other fixed support.

A2 is the portion of the main frame extending upwardly and dividing into two portions, one of which forms the bearing A3 for the motor-crank shaft pand stud-supports'for the grinding-wheel frame and the other portion A4. extending upward vand to a point in line with the bearing A3, forming the bearing A5. It is thus seen that all of, these bearings are integral. Y

In bosses on the bearing A3'are secured the studs A7 and A11, on which pivots the grinding-wheel frame B. On. the free end of the frame B in the bearings B' and `B2 is journaled the shaft of the grinding-wheel B3. In the bearing A8 is the crank-shaft C, lto which is secured the crank C', the bevel-gear C2, and the bevel-pinion C3. Y In the bearing A? is the shaft C4,- to .which is secured the bevel-gear C5. Eccentrically inserted in the bevel-gear C5, Fig. 5, is the pin C6. Sleeved on the stud A11 is the longitudinally-slotted arm D, Fig.

y5, with a lateral extensionD at its outer end.

The slot D2 in the arm D engages with the piu C3 in the bevel-gear C3, and in the lateral extension D of the arm Dis a hole D3, adapted to receive the thumb-screw E, which passes through the bracket B, Figs. l and 5. On the stud A7 also journals the bevel-pinio`n Fand the sprocket-wheel F', the two beingwconcentric, rigidly connected or preferably integral, and the pinion meshing with the bevelgear C2.

Securedto the shaft B4 of the grinding-wheel B3 is the small sprocket-wheel F2, so placed relative to the sprocket-wheel F that the chain F3 may be passed around them. Pivotally at- IGO tached to the shaft C4 is the hook-link G, Figs. 4 and 6, attachable to or detachable from the frame B through means of the bolt and wingnut G2.

Pivotally attached by a rod A2 to the lugs on the end of the limbsA and A0, which form the base of the grinder-frame, is the secondary frame H, to which is secured the bracket I, to which in turn is clamped and held a mower-knife while being ground. The secondary frame H and the bracket I, united by meanswhich may render the connection either fiexible or rigid, as hereinafter explained,and jointly supporting the mower-knife being operated upon, are held yieldingly in working position by the spring-rod J, attached to the main frame of the grinder with the free end, which takes the spring, lying in a slot in the frame H.Y rlhe thumb-screw H2, received by the lug H3 on the secondary frame H, provides a forward stop for and also means of adjusting the position of the knife-holding device relative to the grinding-wheel. The bracket I is normally secured rigidly to the secondary frame H by means of the pin-bearings I and I2, one of which is shown in Fig. 8, and a cotter I2. When the latter is removed, the connection is rendered flexible, pivoting on the pins I' and l2.

K is a clamp, Fig. l, serving to securely hold the sickle or knife being operated upon to the bracket I.

L is an attachable rest that maybe secured to the base of the grinder-frame by means of' the hook-bolt L', in which case the secondary frame H and bracket I are disengaged from the spring-rod J and allowed to drop backtoy a position in which it will not interfere with the rest, as shown in Fig. 3.

My machine, constructed as hereinbefore set forth, is operated as follows: It' the grinding-wheel frame is to be permitted to oscillate automatically after clamping the sickle or knife in the frame I and securing it with the clamp K, then preparatory to the beginning of the operation the hook-link G, Fig. l, is detached from the frame B by loosening the Wing-nut G2, thus allowing the hook-link to move to an inoperative position. Further than this, also, the thumb-screw E should be advanced until its end enters the hole D3 in the extension D' of the arm D. IVhen thus engaged and the crank C2 turned, an oscillatory movement will be imparted to the grinding-wheel frame through means of the arm D, acted upon by the pin CG in the gearwheel C5. This oscillatory movement of the wheelcarrying frame brings the rotating grindingwheel to act along the cutting edge of the section, While the knife-sections themselves remain practically stationary, the spring-rod J insuring any desired degree of pressure between the surface of section and grinding-wheel. If instead it is desired to manipulate the sickle being operated upon by hand and have the axis of the rotating grinding-wheel remain fixed, then the thumbscrew E in the frame B is turned until its end is disengaged from the arm D, thus disconnecting the grinding-wheel frame from any moving part of the machine. The frame is then secured in position and held by swing-` ing the hook-link G into engagement with the bolt having the Wing-nut G2 and clamping it there. Upon withdrawing the Cotter-pin I3 the knife-bearing bracket I will then be free to swing on its pin-bearings I' and I2. The spring-rod J, as before, holding the sickle against the grinding-wheel, the operator can bring any part of the sickle-section into contact with the said grinding-Wheel or grind on one point, as is often desired in order to remove gaps or nicks in the sickle-section. In grinding or sharpening other tools or instruments the spring-rod J is disengaged from the slot in the secondary frame H, and the said frame H and bracket I are allowed to drop back, as shown in Fig. 3. The rest L is clamped to the base of the frame A by means of the hook-bolt L', (shown in same iigure,) thus adapting the machine to miscellaneous grinding.

What I claim as my invention, and desire to secure by Letters Patent, is

l. In a knife-grinder, a main frame having motorgearing thereon, a grinding Wheel frame pivoted to the said main frame coaxially with the gearing from which motion is imparted to the grinding-wheel, a crank-andslot device operatively connected with the driving mechanism of the machine and adapted to impart automatic oscillatory mo tion to the grinding-Wheel frame, and means independent of the said crankand-slot device for sustaining the said grinding-wheel frame in a fixed position at will, substantially as described.

2. In a knife-grinder, a mainframe having motor gearing thereon, a grinding e wheel frame pivoted to the said main frame coaxially with the gearing from which motion is im parted to the grinding-Wheel, a detachablyconstructed crank-and-slot device operatively connected with the driving mechanism of the machine and adapted to impart automatic oscillatory motion to the grinding-wheel frame, and means independent of the said crank-andslot device for sustaining the said grindingwheel frame in a fixed position at will, substantially as described.

3. In a knife-grinder, a main frame having motor-gearing thereon, a grinding-wheel frame pivoted to the said main frame coaxially with the gearing from which motion is imparted to the grinding-wheel, and an arm pivoted coaxially with the pivotal bearing of the said oscillating grinding-Wheel frame, the said arm being provided with a longitudinal slot at its free end adapted to engage with and be actuated by a stud secured to a moving part of the driving mechanism, and the said arm further provided at its free end with means for engaging it with and actuating the said oscillatorygrindingwheel frame,

IOO

IIO

and independent means for rigidly securing, at will, the said oscillatory grinding- Wheel frame tothe said main frame, all combined substantially as described.

4. In a knife-grinder, a main frame having the motor-gearing thereon, a grinding-wheelV frame pivoted to the said main frame coaxially with the gearing from which motion is imparted to the grinding- Wheel, means for imparting automatic oscillatory motion to the grinding-Wheel frame, means independent of the said means for imparting oscillatory motion to the grinding-Wheel frame for sustaining the said frame in a fixed position, at Will, and an elastically-held knife-bracketsupportingframe, the knife-bracketpivotally supported upon said frame,said pivoted knifebracket adapted to be locked upon the said elastically-held frame, substantially as described.

5. In a knife-grinder, a main frame',a grinding-Wheel frame having a grinding Wheel mounted thereon, a secondary frame pivoted Wheel, and means for unlatching the knifeholding bracket from the main frame and permitting it to swing out of the Way for the purpose of grinding other tools, substantially as described. I

6. vIn a knife-grinder, a main frame having the motor-gearing thereon, a grinding-wheel frame pivoted to the said main frame coaxially with the gearing from which motion is imparted to the grinding-wheel, means for rigidly holding said grinding-Wheel frame in a fixed position at will; an elastically-held knife -bracket -supporting frame, and the knife-bracket pivotally supported upon said frame substantially as described.

JOHN W. LATIMER.

Inv presence of J. C. WARNES, EDWARD R. BARRETT.

seV 

